Added element_types diagram filter (#131)

docs/configuration_file.md

@@ -30,6 +30,7 @@
     * `namespaces` - list of namespaces to include
     * `relationships` - list of relationships to include
     * `elements` - list of elements, i.e. specific classes, enums, templates to include
+    * `element_types` - list of element types e.g. `enum`, `class`, `concept`
     * `access` - list of visibility scopes to include (e.g. `private`)
     * `subclasses` - include only subclasses of specified classes (and themselves)
     * `specializations` - include all specializations or instantiations of a given template
@@ -40,6 +41,7 @@
     * `namespaces` - list of namespaces to exclude
     * `relationships` - list of relationships to exclude
     * `elements` - list of elements, i.e. specific classes, enums, templates to exclude
+    * `element_types` - list of element types e.g. `enum`, `class`, `concept`
     * `access` - list of visibility scopes to exclude (e.g. `private`)
     * `subclasses` - exclude subclasses of specified classes (and themselves)
     * `specializations` - exclude all specializations or instantiations of a given template

docs/diagram_filters.md

@@ -4,6 +4,7 @@
 
 * [`namespaces`](#namespaces)
 * [`elements`](#elements)
+* [`element_types`](#element_types)
 * [`paths`](#paths)
 * [`context`](#context)
 * [`relationships`](#relationships)
@@ -53,6 +54,17 @@ from an included namespace:
       - ns1::ns2::MyClass
 ```
 
+## `element_types`
+
+Allows to include or exclude elements of specific type from the diagram, for instance
+to remove all enums from a diagram add the following:
+
+```yaml
+  exclude:
+    element_types:
+      - enum
+```
+
 ## `paths`
 
 This filter allows to include or exclude from the diagram elements declared